Undefined symbol when inheiriting from UObject when bUseRTTI=1

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I am on Ubuntu 16.04, and tested this with Clang 3.8 as well as 3.9.1:

When enabling RTTI, i.e. setting bUseRTTI=true in MyProject.Build.cs
I get an error from dlopen: undefined symbol: _ZTI7UObject, when my project contains a class, that inheirits from UObject directly.

readelf suggests that there is indeed a symbol required from the shared object, but non of the shared objects of the Unreal Engine export this symbol.

This problem first showed up with Unreal Engine 4.15, and worked with version 4.14.

EDIT:
bUseRTTI does not enable RTTI for the whole engine anymore.
it has to be forced via UEBuildConfiguration.bForceEnableRTTI=true.